Fig. 18

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Rλ and Reff of the Fe II lines detected in atmosphere of KELT- 9b. Top panel : fitted Rλ for each of the lines. The dashed horizontal line indicates Rλ = RP. Bottom panel : calculated Reff values using the amplitude of the detected signal for each of the lines (black dots) and the values obtained by D’Arpa et al. (2024) (green dots).
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